It makes the game interesting. The tree choices for the ancient eras right now are much, much more interesting than in vanilla because there is a choice between them - no single policy tree is the best for all situations and victory types, no single strategy is overwhelmingly superior. This makes the game funner to play than in unmodded BNW, where Tradition + four cities was extremely powerful regardless of what victory type you went for, so you nearly always went for it and it barely impacted your future decisions or game plan.
Choices in the trees themselves are that exact thing but on a smaller, shorter scale. Now that you've invested in the tree, what is your next choice? Do I take this policy and focus on capital growth to gain science yields, or do I invest in going wide and take the left side of the tree for production and the worker? Do I go the left side of Might for the Settler and early expansion or the right side for free units and warfare? Do I take Tradition's additional food or do I take the faith boost to better increase my chances of getting a Great Prophet?
Right now, most of those choices are just as one-sided as "just take tradition" in BNW, but on paper they add depth and experimentation to the game. And as the game is a strategy game, this is what keeps the game fun and interesting after thousands of hour playing it.
ETA: Also, Strigvir, as many people have said, there's no reason for you to be so hostile to other forumgoers. Nobody is "riled up," discussion has been completely civil.
